Yellowish-brown sulfur dye.



-1 rrn EATS BE NHARD JAEOKEL, OF ELBERFELD, GERMANY, ASSIGNOR TO FARBENFABRIKEN VORM. FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

YE LLOWISH-IBROWN SULFUR nonsoee e.

' Specification of Letters Patent.

Patented Aug. 25, 1908.

Application filed April 8, 1908. Serial No. 425,846. v

To all whom "it may concern:

doctor of philosophy, chemist, citizen of the German Empire, residing at Elberfeld, Germany, Kingdom of Prussia, have invented new and useful Improvements in Yellowish- Brown Sulfur Dyes, of which the following is a specification.

Another application for Letters Patent of same date concerns the manufacture and production of new yellowish-brown to orange sulfur-dyestuffs which can be obtained by heating with sulfur: mixtures of meta-diamins a'lk'ylated in the aromatic nucleus with nitroamins or derivatives thereof the one of which components must be alkylated in the aromatic nucleus and transforming the sulfid colors .into soluble compounds by heating them with alkaline sulfids. I have now found that dyes giving a yellower shade are obtained by carrying out the process inthe presence soluble in dilute caustic soda lye with a yellowish-brown color.

In order to illustrate the new process more fully the following example is given, the

- parts being by weight: 108 parts of metatoluylenediamin, together with parts of meta-nitranilin;60 parts of benzidin and 600 parts of sulfur, are heated to 240250 C. for 12 hours. When cold the melt is pulverized and is heated to from 80 to 100 C. with +150 parts of a 100 per cent. solution of sodium sullid and 2000 parts of water until a clear olution results. The mixture is then diluted uith water and the dyestuif is precipiln-led with dilute acids. It is filtered oil, dried and ground.

My new d veslull' is after being dried and pulverized a ycllowidbrown powder which is practicallyinsoluble inpure Water, but soluble inwater in the resence of sodium sullid with a yellowish rown color, it is hardly soluble in dilute caustic soda lye with a yollmvish-brown color and practically insoluble in concentrated sulfuric .acid (66 lsanme). ll dyes unmordanted cotton in a bath of sodium sulfid orange-yellow shades.

The process is carried out in an analogous .manner on using other of the above men- Be it known that I, BERNHARD, JAEcKEL, Y

tioned mixtures.

The same dyestufiscan be obtained by replacing the nitroamino-compounds by the corresponding dinitro compounds or by heat-1 in what manner the same is performed, what I claim as new, andl desire to. secure by Letters Patent, is 1} 1. The herein-described new sulfur dyestuifs resulting fron iithe reaction of sulfur on a mixture of aromatic meta-diamins with nitroamins the one of which components must.

be alkylated in the aromatic nucleus, and benzidin com ounds, which are after being dried and pu verized yellowish-brown powders practically insoluble in pure water butsolub e lIl water in the presence of sodium 'sulfid with a yellowish-brown color, hardly soluble in dilute caustic soda. lye with a yellowish-brown color; and which dye unmordanted cotton in a bath containing sodium sulfid from yellow. to orange shades, substantially as hereinbefore described.

2. The herein-described new sulfur dyestulf resulting from the reaction of sulfur on a mixture of meta-toluylenediamin with meta-nitranilin a'nd benzidin, whic h-is after being dried and ulverized a yellowish-brown powder irisolub e in pure water but. soluble in water in the presence ofsodium sulfid with a yellowish-brown color hardly soluble in dilute caustic soda lye with a yellowish-brown color and practically insoluble in concentrated sulfuric acid, and which dyes unmoidanted cotton in a bath containing sodium sulfid orange-yellow shades, substantially as hereinbefore described.

In testimony whereof l have hereunto set my hand in the presence of two subscribing Witnesses.

BERNIIARI) JAEOKEL. 

